From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock Add a sleepable verifier test that loads a graph-node local kptr in an explicit RCU read-side critical section, then passes its node to bpf_rbtree_remove() after the section ends. Before the verifier fix, the stale NON_OWN_REF flag makes the node look like a live borrowed reference and the program is accepted. After the fix, the pointer is demoted without NON_OWN_REF and the graph kfunc argument is rejected. Also exercise a graph kptr loaded while a spin lock provides implicit RCU protection. The pointer must be invalidated when the lock is released, which guards the required ordering between non-owning-reference invalidation and RCU demotion. Update the existing fault-protected load test state description. The post-unlock pointer no longer carries NON_OWN_REF, but remains readable because the load is rewritten to use BPF_PROBE_MEM. Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- drivers/dma/idxd/Makefile | 12 ++++++++++++ 1 file changed, 12 insertions(+) create mode 100644 drivers/dma/idxd/Makefile (limited to 'drivers/dma/idxd/Makefile') diff --git a/drivers/dma/idxd/Makefile b/drivers/dma/idxd/Makefile new file mode 100644 index 000000000..9ff9d7b87 --- /dev/null +++ b/drivers/dma/idxd/Makefile @@ -0,0 +1,12 @@ +ccflags-y += -DDEFAULT_SYMBOL_NAMESPACE='"IDXD"' + +obj-$(CONFIG_INTEL_IDXD_BUS) += idxd_bus.o +idxd_bus-y := bus.o + +obj-$(CONFIG_INTEL_IDXD) += idxd.o +idxd-y := init.o irq.o device.o sysfs.o submit.o dma.o cdev.o debugfs.o defaults.o + +idxd-$(CONFIG_INTEL_IDXD_PERFMON) += perfmon.o + +obj-$(CONFIG_INTEL_IDXD_COMPAT) += idxd_compat.o +idxd_compat-y := compat.o -- cgit v1.3.1